US4878299A - Insulating apparatus for thermally insulating a dryer head - Google Patents

Insulating apparatus for thermally insulating a dryer head Download PDF

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Publication number
US4878299A
US4878299A US07/072,082 US7208287A US4878299A US 4878299 A US4878299 A US 4878299A US 7208287 A US7208287 A US 7208287A US 4878299 A US4878299 A US 4878299A
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US
United States
Prior art keywords
insulator
dryer
head
dryer head
insulating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/072,082
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English (en)
Inventor
Gregory L. Wedel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Mitsubishi Heavy Industries Ltd
Original Assignee
Beloit Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beloit Corp filed Critical Beloit Corp
Priority to US07/072,082 priority Critical patent/US4878299A/en
Assigned to BELOIT CORPORATION reassignment BELOIT CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WEDEL, GREGORY L.
Priority to CA000568712A priority patent/CA1290938C/en
Priority to JP63166069A priority patent/JPS6433294A/ja
Application granted granted Critical
Publication of US4878299A publication Critical patent/US4878299A/en
Assigned to BELOIT TECHNOLOGIES, INC. reassignment BELOIT TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BELOIT CORPORATION
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., METSO PAPER INC. reassignment MITSUBISHI HEAVY INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BELOIT TECHNOLOGIES, INC.
Anticipated expiration legal-status Critical
Assigned to VALMET TECHNOLOGIES, INC. reassignment VALMET TECHNOLOGIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: METSO PAPER, INC.
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • F26B13/18—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning heated or cooled, e.g. from inside, the material being dried on the outside surface by conduction
    • F26B13/183—Arrangements for heating, cooling, condensate removal
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/021—Construction of the cylinders

Definitions

  • This invention relates to an insulating apparatus for thermally insulating a dryer head journalled in a dryer section of a papermaking machine. More particularly, this invention relates to a stationary insulator for inhibiting the loss of heat from a drying cylinder of a papermaking machine.
  • the formed, pressed web of paper is guided around a plurality of heated dryer drums in order to remove any excess moisture from the pressed web.
  • Such dryer drums are heated by steam supplied to the inside of the rotatable dryer drums.
  • Each dryer drum includes a cylindrical shell enclosed by opposed dryer heads rotatably journalled within support bearings.
  • steam when steam is supplied to the inside of the rotatable dryer drum, heat is thermally conducted through the shell towards the paper web guided around the rotatable shell.
  • a significant percentage of the thermal energy supplied to the dryer drum is conducted through the respective dryer heads and is lost by convection and radiation to the ambient surroundings.
  • a rotatable insulator cover to a typical dryer drum having a 5 foot diameter may present relatively few problems, this is not the case when endeavoring to insulate the dryer heads of a Yankee Dryer or a machine-glazed (MG) cylinder which can be in the order of 8 to 25.5 feet in diameter.
  • MG machine-glazed
  • the provision of such a large rotating cover presents a potential hazard, particularly when applied to current Yankee and machine glazing dryer cylinders which operate at speeds of 3000 fpm or more.
  • the rotating parts of the prior art insulator covers could cause harm or damage if they were to inadvertently contact personnel or adjacent equipment.
  • the results would be disastrous.
  • the present invention seeks to overcome the aforementioned potentially lethal situation by providing a stationary insulator having a sealing means disposed between the periphery of the insulator and the rotatable dryer head so that thermal losses are reduced and safety hazards are inhibited.
  • Another object of the present invention is the provision of an insulating apparatus which includes a stationary insulator having a disc-shaped configuration with a central bore for the rotatable reception therein of the dryer head journal.
  • Another object of the present invention is the provision of an insulating apparatus which includes a peripheral sealing means which extends circumferentially around the insulator for inhibiting the flow of convection currents past the periphery of the insulator thereby reducing thermal losses through the head.
  • Another object of the present invention is the provision of an insulating apparatus which includes an air cap which is disposed adjacent to the dryer head with the air cap extending around a portion of the circumference of the dryer and a flexible seal which physically contacts, and sealingly engages, the air cap for inhibiting the flow of convection currents from the dryer head past the flexible seal.
  • Another object of the present invention is the provision of an insulating apparatus in which the diameter of the insulator is greater than the diameter of the dryer head such that when the air cap is retracted away from the dryer head, the flexible seal still maintains sealing engagement with the air cap.
  • the present invention relates to an insulating apparatus and method for thermally insulating a dryer head journalled in a dryer section of a papermaking machine.
  • the apparatus includes a stationary insulator having a disc-shaped configuration.
  • the insulator defines a central bore for the rotatable reception therein of the journal.
  • a peripheral sealing means extends circumferentially around the insulator for inhibiting the flow of convection currents past the periphery of the insulator thereby reducing thermal losses through the head.
  • the stationary insulator defines a first and a second face.
  • a stainless steel cover having a disc-shaped configuration cooperates with, and is disposed contiguous with, the first face of the insulator.
  • the peripheral sealing means also includes an annular rim and fastening means for fastening the rim to the periphery of the insulator.
  • a flange means is secured to, and extends away from, the rim.
  • the flexible seal means is secured to the flange means for sealing the periphery of the insulator relative to the head.
  • the flange means includes a first and a second flange which extend coaxially relative to the rim.
  • the flange means includes a flange which extends radially away from the rim.
  • the flexible seal means physically contacts, and sealingly engages, the rotatable dryer head thereby inhibiting the flow of convection currents past the flexible seal means.
  • an air cap is disposed adjacent to the dryer head with the air cap extending around a portion of the circumference of the dryer head.
  • the flexible seal means physically contacts, and sealingly engages, the air cap for inhibiting the flow of convection currents from the dryer head past the flexible seal means.
  • the flexible seal means includes a first and a second seal with the seals being of annular configuration and coaxial relative to each other.
  • the seals are fabricated from felt, or felt like material, and the diameter of the insulator is greater than the diameter of the dryer head such that the difference between the diameter of the insulator and the diameter of the dryer head is such that when the air cap is retracted from the dryer head, the flexible seal means still maintains sealing engagement with the air cap.
  • FIG. 1 is a sectional view of a typical dryer drum showing the stationary insulator according to the present invention.
  • FIG. 2 is an enlarged sectional view taken on the line 2--2 of FIG. 1.
  • FIG. 3 is an enlarged sectional view of the peripheral sealing means shown in FIG. 1.
  • FIG. 4 is a fragmentary sectional view of an alternative embodiment of the present invention showing an air cap disposed adjacent to the dryer head with the air cap in an operative position relative to the dryer.
  • FIG. 5 is a sectional view similar to that shown in FIG. 4 but with the air cap in the retracted position
  • FIG. 6 is an alternative embodiment of the present invention showing a fixed air cap with an alternative peripheral sealing means.
  • FIG. 1 is a sectional view of a typical Yankee Dryer generally designated 10.
  • the dryer 10 includes a cylindrical shell 12 for guiding a paper web (not shown) thereabout.
  • the dryer 10 also includes a hollow central body portion 14 having journals 16 and 18 extending axially therefrom.
  • a first and a second dryer head 20 and 22 extend respectively from the first and second end 24 and 26 of the body portion 14 and are secured to the shell 12 such that the shell 12 is able to rotate with the dryer heads 20 and 22 and body portion 14 within support bearings 28 and 30 of the dryer 10.
  • Steam is introduced into the hollow body portion 14 by means of a centrally-disposed supply pipe 32. This steam communicates with the inner surface 34 of the shell 12 by means of a hole 36 extending through the body portion 14.
  • an insulating apparatus thermally insulates the dryer head 20 which is journalled in the dryer section of the papermaking machine.
  • the apparatus 40 includes the stationary insulator 38 which is of disc-shaped configuration.
  • the insulator 38 defines a central bore 42 for the rotatable reception therein of the journal 16.
  • a peripheral sealing means generally designated 44 extends circumferentially around the insulator 38 for inhibiting the flow of convection currents past the periphery 46 of the insulator 38 thereby reducing thermal losses through the head 20.
  • the stationary insulator 38 defines a first and second face 48 and 50 respectively and a metallic stainless steel cover 52 of disc-shaped configuration cooperates with, and is disposed contiguous with, the first face 48 of the insulator 38.
  • FIG. 3 is an enlarged sectional view of a portion of the peripheral sealing means 44 which includes an annular rim 54 with fastening means 56 for fastening the rim 54 to the periphery 46 of the insulator 38.
  • Flange means generally designated 58 are secured to, and extend away from, the rim 54.
  • Flexible seal means generally designated 60 are secured to the flange means 58 for sealing the periphery 46 of the insulator 38 relative to the dryer head 20.
  • the flange means 58 includes a first and second flange 62 and 64 which extend coaxially relative to each other and away from the rim 54.
  • the flexible seal means 44 physically contacts, and sealingly engages, the rotatable dryer head 20 thereby inhibiting the flow of convection currents past the flexible seal means 44.
  • FIG. 4 shows an alternative embodiment of the present invention in which an air cap 66 is disposed adjacent to the dryer head 20A.
  • the air cap 66 extends around a portion of the circumference of the dryer head 20A and the flexible seal means 44A physically contacts and sealingly engages the air cap 66 for inhibiting the flow of convection currents from the dryer 20A head past the flexible seal means 44A.
  • the flexible seal means 44A includes a first and a second seal 68 and 70 respectively with the first and second seals 68 and 70 being of annular configuration and coaxial relative to each other. These seals 68 and 70 may be fabricated from felt.
  • FIG. 5 is a view familiar to the view shown in FIG. 4 but shows the air cap 66 retracted away from the dryer head 20A and shell 12A.
  • the diameter D1 of the insulator 38A is greater than the diameter D2 of the dryer head 20A with the difference between the diameter D1 of the insulator 38A and the diameter D2 of the dryer head 20A being such that when the air cap 66 is retracted away from the dryer head 20A the flexible seal means 44A still maintains sealing engagement with the air cap 66 as shown.
  • FIG. 6 shows a further embodiment of the present invention including a stationary air cap 66B with the flexible sealing means 44B extending between the periphery 46B of the insulator 38B and the air cap 66B.
  • the flange means 58B includes a flange 72 which extends radially away from a rim 54B.
  • the dryer heads 20 and 22 and shell 12 rotate within the bearings 28 and 30 respectively but the insulator 38 is disposed stationary relative to the rotatable dryer.
  • the peripheral sealing means 44 prevent the flow of convection currents therepast, thereby reducing thermal losses through the respective dryer heads.
  • the present invention avoids the danger of having a heavy and sizable cover rotating at high speed coming adrift relative to a dryer. Furthermore, with the prior art rotatable insulators, there existed a tendency for the insulation to settle and become thrown by centrifugal force outwardly thereby reducing the thermal insulation of the apparatus. Additionally, the present invention enables the provision of a manhole at a fixed location such that inspection of the dryer head and code plates thereon is readily accessible. Further, with the prior art rotatable insulators, difficulties were experienced with inspecting the heads of the dryers for leaks and cracks. The present invention enables simple attachment of the insulator relative to the dryer head with no necessity for attachment bosses on the dryer heads.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
US07/072,082 1987-06-10 1987-07-10 Insulating apparatus for thermally insulating a dryer head Expired - Lifetime US4878299A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US07/072,082 US4878299A (en) 1987-07-10 1987-07-10 Insulating apparatus for thermally insulating a dryer head
CA000568712A CA1290938C (en) 1987-06-10 1988-06-06 Insulating apparatus
JP63166069A JPS6433294A (en) 1987-07-10 1988-07-05 Apparatus and method for insulating dryer head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/072,082 US4878299A (en) 1987-07-10 1987-07-10 Insulating apparatus for thermally insulating a dryer head

Publications (1)

Publication Number Publication Date
US4878299A true US4878299A (en) 1989-11-07

Family

ID=22105446

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/072,082 Expired - Lifetime US4878299A (en) 1987-06-10 1987-07-10 Insulating apparatus for thermally insulating a dryer head

Country Status (3)

Country Link
US (1) US4878299A (cs)
JP (1) JPS6433294A (cs)
CA (1) CA1290938C (cs)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070245588A1 (en) * 2006-04-21 2007-10-25 Haurie Osvaldo R Cylindrical dryer having conduits for heating medium
US20070284069A1 (en) * 2005-12-15 2007-12-13 Dow Global Technologies Inc. Process for increasing the basis weight of sheet materials
US20070289156A1 (en) * 2005-01-05 2007-12-20 Rainer Kloibhofer Device and method for producing and/or finishing a fibrous material
ITPI20080112A1 (it) * 2008-10-31 2010-05-01 Fomat S R L Struttura di protezione e coibentazione per le testate di un cilindro di asciugatura di un foglio continuo di carta per cartiere
US7807023B2 (en) * 2005-12-15 2010-10-05 Kimberly-Clark Worldwide, Inc. Process for increasing the basis weight of sheet materials
ITFI20090195A1 (it) * 2009-09-09 2011-03-10 Toscotec S P A "cilindro monolucido coibentato"
US8127462B2 (en) 2006-04-21 2012-03-06 Osvaldo Ricardo Haurie Cylindrical dryer having conduits provided within a plurality of holding plates
US8568561B2 (en) 2009-03-20 2013-10-29 Kimberly-Clark Worldwide, Inc. Creped tissue sheets treated with an additive composition according to a pattern
WO2015056154A1 (en) 2013-10-15 2015-04-23 A.Celli Paper S.P.A. Insulation for cylinder heads
CN104792149A (zh) * 2015-04-27 2015-07-22 江苏华东造纸机械有限公司 工业钢制焊接加热烘筒
US9885152B2 (en) * 2013-07-05 2018-02-06 Voith Patent Gmbh Large cylinder drying roller and method for producing a large cylinder drying roller

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1640855A (en) * 1926-09-23 1927-08-30 Shlick Leo Drying cylinder
US2817908A (en) * 1954-08-19 1957-12-31 Beloit Iron Works Yankee drier
US4385454A (en) * 1981-04-28 1983-05-31 Leland A. Withers, Sr. Insulation blanket and band clamps
US4399169A (en) * 1981-06-22 1983-08-16 Mcgowan Paul J Insulative end cap for cylindrical metal drying rollers of paper drying machines, and process for fabrication thereof
US4450631A (en) * 1978-09-18 1984-05-29 Bunnell Plastics, Inc. Heated can rolls of high thermal efficiency
US4506459A (en) * 1983-11-21 1985-03-26 Illinois Tool Works Inc. Fastener assembly for thermal insulation end panel for a paper machine dryer cylinder
US4520578A (en) * 1982-05-26 1985-06-04 J.M. Voith Gmbh Drying cylinder adapted to be heated with steam

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1640855A (en) * 1926-09-23 1927-08-30 Shlick Leo Drying cylinder
US2817908A (en) * 1954-08-19 1957-12-31 Beloit Iron Works Yankee drier
US4450631A (en) * 1978-09-18 1984-05-29 Bunnell Plastics, Inc. Heated can rolls of high thermal efficiency
US4385454A (en) * 1981-04-28 1983-05-31 Leland A. Withers, Sr. Insulation blanket and band clamps
US4399169A (en) * 1981-06-22 1983-08-16 Mcgowan Paul J Insulative end cap for cylindrical metal drying rollers of paper drying machines, and process for fabrication thereof
US4520578A (en) * 1982-05-26 1985-06-04 J.M. Voith Gmbh Drying cylinder adapted to be heated with steam
US4506459A (en) * 1983-11-21 1985-03-26 Illinois Tool Works Inc. Fastener assembly for thermal insulation end panel for a paper machine dryer cylinder

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070289156A1 (en) * 2005-01-05 2007-12-20 Rainer Kloibhofer Device and method for producing and/or finishing a fibrous material
US20070284069A1 (en) * 2005-12-15 2007-12-13 Dow Global Technologies Inc. Process for increasing the basis weight of sheet materials
US7678231B2 (en) * 2005-12-15 2010-03-16 Dow Global Technologies, Inc. Process for increasing the basis weight of sheet materials
US7807023B2 (en) * 2005-12-15 2010-10-05 Kimberly-Clark Worldwide, Inc. Process for increasing the basis weight of sheet materials
US8127462B2 (en) 2006-04-21 2012-03-06 Osvaldo Ricardo Haurie Cylindrical dryer having conduits provided within a plurality of holding plates
US7614161B2 (en) * 2006-04-21 2009-11-10 Osvaldo Ricardo Haurie Cylindrical dryer having conduits for heating medium
US20070245588A1 (en) * 2006-04-21 2007-10-25 Haurie Osvaldo R Cylindrical dryer having conduits for heating medium
ITPI20080112A1 (it) * 2008-10-31 2010-05-01 Fomat S R L Struttura di protezione e coibentazione per le testate di un cilindro di asciugatura di un foglio continuo di carta per cartiere
WO2010049804A3 (en) * 2008-10-31 2010-11-18 Fomat S.R.L. Thermally insulating structure for a head wall of a paper drying cylinder
US8568561B2 (en) 2009-03-20 2013-10-29 Kimberly-Clark Worldwide, Inc. Creped tissue sheets treated with an additive composition according to a pattern
CN102482846B (zh) * 2009-09-09 2014-11-19 托斯克科技股份公司 绝热的杨基滚筒
CN102482846A (zh) * 2009-09-09 2012-05-30 托斯克科技股份公司 绝热的杨基滚筒
US8398822B2 (en) 2009-09-09 2013-03-19 Toscotec S.P.A. Thermally insulated Yankee cylinder
WO2011030363A1 (en) * 2009-09-09 2011-03-17 Toscotec S.P.A. Thermally insulated yankee cylinder
ITFI20090195A1 (it) * 2009-09-09 2011-03-10 Toscotec S P A "cilindro monolucido coibentato"
US9885152B2 (en) * 2013-07-05 2018-02-06 Voith Patent Gmbh Large cylinder drying roller and method for producing a large cylinder drying roller
US10179974B2 (en) * 2013-07-05 2019-01-15 Voith Patent Gmbh Method for producing a large cylinder drying roller
WO2015056154A1 (en) 2013-10-15 2015-04-23 A.Celli Paper S.P.A. Insulation for cylinder heads
CN105829604A (zh) * 2013-10-15 2016-08-03 亚赛利纸业设备股份公司 用于缸盖的隔热系统
US9856604B2 (en) 2013-10-15 2018-01-02 A. Celli Paper S.P.A. Insulation for cylinder heads
CN104792149A (zh) * 2015-04-27 2015-07-22 江苏华东造纸机械有限公司 工业钢制焊接加热烘筒

Also Published As

Publication number Publication date
CA1290938C (en) 1991-10-22
JPH0370040B2 (cs) 1991-11-06
JPS6433294A (en) 1989-02-03

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